Roll Gap Adjust Mechanism

ABSTRACT

In accordance with an example embodiment, a mower-conditioner may include first and second conditioning rolls, at least one eccentric, and a linkage having a lever. The first and second conditioning rolls are spaced apart a distance. The at least one eccentric is coupled to the mower-conditioner. The lever is coupled between the eccentric assembly and the first conditioning roll. The rotation of the at least one eccentric about a pivot axis causes the first conditioning roll to move via the lever, which adjusts the distance between the first and second conditioning rolls.

RELATED APPLICATIONS

This is a divisional application of U.S. application Ser. No.15/963,611, titled Roll Gap Adjust Mechanism, filed Apr. 26, 2018 whichclaims the benefit of U.S. provisional application No. 62/505,602,titled Roll Gap Adjust Mechanism, filed May 12, 2017, and U.S.provisional application No. 62/597,239, titled Roll Gap Adjust Mechanismfiled Dec. 11, 2017, all of which are hereby incorporated by referencein their entirety.

FIELD OF THE DISCLOSURE

The present disclosure relates generally to agricultural equipmenthaving crop conditioning rolls, and more particularly to a mechanism foradjusting a roll gap between conditioning rolls.

BACKGROUND OF THE DISCLOSURE

In the hay and forage industry among others, mower-conditioners, rotaryplatforms or heads, and draper platforms or heads include conditioningrolls which condition crop material after it is cut. The crop materialis cut, then pressed or crushed between the conditioning rolls beforebeing returned to the ground for drying. Conditioning, which crimps thestems and leaves, increases the loss of water in the crop material andfurther reduces the drying period. Once the crop material hassufficiently dried, the crop can be further processed or harvested bybaling, combining, or chopping.

There are multiple factors such as the type of crops, type of rolls,weather, and terrain which influence the required conditioning level.One of the methods to change the conditioning level is to adjust a rollgap between the conditioning rolls. The smaller the roll gap, the morepressure is exerted on the crops. Currently, manual adjustment of theroll gap requires operators to stop their cutting or harvestingoperations. However, this kind of adjustment is not efficient,especially for high frequency adjustments.

SUMMARY OF THE DISCLOSURE

This summary is provided to introduce a selection of concepts that arefurther described below in the detailed description and accompanyingdrawings. This summary is not intended to identify key or essentialfeatures of the appended claims, nor is it intended to be used as an aidin determining the scope of the appended claims.

According to an aspect of the present disclosure, a mower-conditionermay include first and second conditioning rolls, at least one eccentricassembly, and a linkage. The first and second conditioning rolls arespaced apart a distance. The at least one eccentric assembly is coupledto the mower-conditioner. The linkage is coupled between the at leastone eccentric assembly and the first conditioning roll. The movement ofthe at least one eccentric assembly causes the first conditioning rollto move via the linkage, which adjusts the distance between the firstand second conditioning rolls.

These and other features will become apparent from the followingdetailed description and accompanying drawings, wherein various featuresare shown and described by way of illustration. The present disclosureis capable of other and different configurations and its several detailsare capable of modification in various other respects, all withoutdeparting from the scope of the present disclosure. Accordingly, thedetailed description and accompanying drawings are to be regarded asillustrative in nature and not as restrictive or limiting.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description of the drawings refers to the accompanyingfigures in which:

FIG. 1 is a rear perspective view of a mower-conditioner with eccentricassemblies coupled to the ends of a shaft and the ends of a conditioningroll;

FIG. 2 is a partial rear perspective view of the mower-conditioner ofFIG. 1;

FIG. 3 is a partial view of another embodiment of a mower-conditionerwith an eccentric assembly coupled to a shaft and a middle portion of aconditioning roll;

FIG. 4 is a partial left side view of the mower-conditioner of FIG. 1;

FIG. 5 is an exploded view of an eccentric assembly with a resilientunit;

FIG. 6 is a partial exploded view of an eccentric assembly;

FIG. 7A is side view of an eccentric rotating counter clockwise, withdistance between the eccentric slot and the edge increasing gradually;

FIG. 7B is side view of another embodiment of an eccentric rotatingcounter clockwise, with distance between the eccentric slot and the edgedecreasing gradually;

FIG. 7C is side view of another embodiment of an eccentric rotatingcounter clockwise;

FIG. 7D is side view of another embodiment of eccentric rotating counterclockwise;

FIG. 7E is side view of another embodiment of eccentric rotating counterclockwise;

FIG. 7F is side view of another embodiment of eccentric rotating counterclockwise;

FIG. 8A is side view of another embodiment of an eccentric with therotating axis off center and a supporting member positioned in one endof an arcuate slot;

FIG. 8B illustrates the embodiment of the eccentric of FIG. 8A when thesupporting member slides to another portion of the arcuate slot;

FIG. 9A is a perspective exploded view of an adjustment assembly havinga plurality of members with helical surfaces engaging with one another;

FIG. 9B is a side exploded view of the adjustment assembly of FIG. 9A;

FIG. 9C is a partial cutaway side view of interactions between themembers of FIG. 9A;

FIG. 9D is a top view of a first member of FIG. 9A;

FIG. 9E is a top view of a second member of FIG. 9A;

FIG. 9F is a top view of a third member of FIG. 9A;

FIG. 10A is a perspective exploded view of another embodiment of anadjustment assembly having a plurality of members with helical surfacesengaging with one another;

FIG. 10B is a top view of a first member of FIG. 10A;

FIG. 10C is a top view of a second member of FIG. 10A;

FIG. 10D is a top view of a third member of FIG. 10A;

FIG. 11A is a side view of another embodiment of an adjustment assemblyhaving a plurality of members with helical surfaces engaging with oneanother;

FIG. 11B is a side view of interactions among the members of FIG. 11Awhen one of the members rotates relative to the other member;

FIG. 11C is a top view of two adjustment assemblies of FIG. 11A, each ofwhich coupled to an actuator;

FIG. 11D is a top view of two adjustment assemblies of FIG. 11B, each ofwhich coupled to an actuator;

FIG. 12A is a side view of another embodiment of an adjustment assemblyhaving a plurality of members with helical surfaces engaging with oneanother;

FIG. 12B is a side view of interactions among the members of FIG. 12Awhen one of the members rotates relative to the other member;

FIG. 12C is a top view of two adjustment assemblies of FIG. 12A, withthe two adjustment assemblies coupled with each other, and one of theadjustment assemblies coupled to an actuator;

FIG. 12D is a top view of two adjustment assemblies of FIG. 12B, withthe two adjustment assemblies coupled with each other, and one of theadjustment assemblies coupled to an actuator;

FIG. 13 is a partial right perspective view of a mower-conditioner withan embodiment of an eccentric;

FIG. 14 is a partial right side view of the mower-conditioner of FIG.13;

FIG. 15 is a partial right perspective view of a mower-conditioner ofFIG. 13.

DETAILED DESCRIPTION

This disclosure relates to the mower-conditioners, rotary platforms orheads, draper platforms and heads, and other crop cutting andconditioning equipment. Although the description is directed tomower-conditioners, the description is equally applicable toself-propelled windrower platforms or heads. The number and location ofthe mower-conditioners are not limited. For example, themower-conditioner(s) can be pulled behind a vehicle such as truck ortractor. The mower-conditioner(s) can be positioned behind or beside thevehicle. Alternatively, the mower-conditioner(s) can operate in front ofthe vehicle.

This disclosure provides a solution for operators that they are notrequired to stop their current operation to manually adjust a roll gapbetween two rolls of the mower-conditioner. At least one of theconditioning rolls is configured to raise or lower to increase ordecrease the roll gap between the rolls. To adjust the roll gap, anactuator, such as a linear actuator, may be coupled to an eccentric. Theextension and contraction of the actuator can cause the eccentric torotate. The eccentric is coupled to one of the conditioning rolls sothat the roll gap between the conditioning roll adjusts, increases ordecreases, as the eccentric rotates.

This disclosure also includes an advantage of a relief or releasemechanism to protect the eccentric and actuator from an impact to atleast one of the rolls. When material, such as hardened soil, excessiveplant material, or a rock passes between the rolls, at least one of therolls will suddenly move. The relief mechanism allows this movement orimpact of the roll to bypass the eccentric.

These and other aspects and advantages of the disclosure will becomeapparent from the following description of the drawings. The embodimentsdisclosed in the drawings and the description are not intended to beexhaustive or to limit the disclosure to these embodiments. Rather,there are several variations and modifications which may be made withoutdeparting from the scope of the present disclosure.

With reference to FIG. 1, a mower-conditioner 1 comprises a frame 11,two conditioning rolls 21, 22, an actuator 3, a shaft 4, two shaftsupporting elements 5, two eccentric assemblies 6 and resilient units 7.The two conditioning rolls 21, 22 are rotatably coupled to the frame 11,adjacent to the opening exit and positioned generally parallel forconditioning the crops. The crop flow is shown as arrow C.

The two supporting elements 5 are coupled to the upper portion of theframe 11. In this embodiment, the shaft supporting elements 5 areadjacent to the eccentric assemblies 6 which are located at the edges ofthe frame 11 in a lateral direction. The shaft supporting elements 5 areused to support the weight and maintain the position of the shaft 4. Inthis embodiment, the shaft supporting elements 5 are sheet metal mounts.Alternatively, the shaft supporting elements 5 may comprise a bearing(not shown) surrounding a portion of the shaft 4 allowing the shaft torotate more easily.

With reference to FIG. 2. One end of the actuator 3 is coupled to theframe 11 and the other end of the actuator 3 coupled to a shaft 4 via aconnecting element 41. The connecting element 41 in this embodimentcomprises two generally parallel portions fixed on the shaft 4 bywelding or other means. A portion of the actuator 3 is between theparallel portions and pivotally coupled to them. In this implementation,the actuator is configured to rotate the shaft via contraction andextension.

As described above, there are two eccentric assemblies 6, each of whichrespectively coupled to one of the ends of the shaft 4 in thisembodiment. However, the number of eccentric assemblies 6 can vary fromat least one and can be positioned anywhere along the width of the frame11. For example, FIG. 3 depicts another embodiment of amower-conditioner 1 with one eccentric assembly 6 coupled to a portionof a shaft 4 and coupled to the middle of the conditioning roll 21 inthe lateral direction. The conditioning roll 21 has two segmentsseparated in the middle of the roll. Between the segments there is ashaft (not shown) concentric to the rotation axis of the conditioningroll 21. The eccentric assembly 6 is coupled to the shaft to change theroll gap.

With reference to FIGS. 4-6, each of the eccentric assemblies mayinclude a first eccentric 61, a second eccentric 62, a supporting member63, and a linkage 64, according to this embodiment. Alternatively, theeccentric assembly may include a single eccentric. The first eccentric61 and the second eccentric 62 can be coupled by one or more connectingtool, such as fasteners. The supporting member 63 can be located betweenthe first eccentric 61 and the second eccentric 62.

The first eccentric 61 is coupled to the shaft 4 and comprises a firstslot 611 positioned on the first eccentric 61. The first slot 611 inthis embodiment is arcuate and has a first portion a1 and a secondportion a2. One end of the supporting member 63 is slidable along thefirst slot 611 when the shaft 4 is rotated. The supporting member 63 hasa first position m1 when the supporting member 63 is located at thefirst portion a1 of the first slot 611 and a second position m2 when thesupporting member 63 is located at the second portion a2 of the firstslot 611.

The second eccentric 62 is coupled to the shaft 4 and comprises a secondslot 621 positioned on the second eccentric 62. The second slot 621 inthis embodiment is arcuate and has a third portion a3 and a fourthportion a4. The third portion a3 is corresponding to the first portiona1 of the first eccentric 61; the fourth portion a4 is corresponding tothe second portion a2 of the first eccentric 61. The other end of thesupporting member 63 is slidable along the second slot 621 when theshaft 4 is rotated. The supporting member 63 has the first position m1when the supporting member 63 is also located at the third portion a3 ofthe second slot 621 and the second position m2 when the supportingmember 63 is also located at the fourth portion a4 of the second slot621.

The linkage 64 is coupled to the supporting member 63 and to theconditioning roll 21. The linkage 64 is configured to move together withthe supporting member 63 which results in the two conditioning rolls 21,22 having a first roll gap when the supporting member 63 is in the firstposition m1 and a second roll gap when the supporting member is in thesecond position m2. Different implementations of the eccentric thatchange the roll gap in specific patterns will be discussed in referenceto FIGS. 7A-7F, FIGS. 8A-8B.

The linkage 64 may be one element directly coupled the supporting member63 and the conditioning roll 21 or multiple elements linking thesupporting member 63 and conditioning roll 21. Referring to FIG. 5, thelinkage 64 in this embodiment comprises a linear portion 641, lever 642,and a restraining member 643. The linkage 64 is at least partiallypositioned within an aperture 631 of the supporting member 63. Thelinear portion 641 is a rod configured to move within the aperture 631in a first direction (partially downward) and in a second directionsubstantially opposite the first direction. The lever 642 includes afirst connecting portion 6421, a roll carry portion 6422, a pivotportion 6423, and a second connecting portion 6424. The first connectingportion 6421 provides pivotal connection for the bottom of the linearportion 641. The roll carry portion 6422 is coupled to one end of theconditioning roll 21. The pivot portion 6423 is directly coupled to theframe 11 and the lever 642 is configured to rotate about the axis of thepivot portion 6423. The second connecting portion 6424 is coupled to theresilient unit 7. Referring again to FIG. 4, when the actuator 3extends, the shaft 4, the first and second eccentrics 61, 62 rotatecounter clockwise. The support member 63 and the linear portion 641 aremoved upward and therefore the lever 642 rotates about the axis of pivotportion 6423 clockwise. The conditioning roll 21 is moved partiallyupward with the rotation of the lever 642. The roll gap is change inthis regard. In addition, the resilient unit 7 is extended during therotation of the lever 642.

Referring to FIGS. 5-6, the restraining member 643, as a threadedfastener in this embodiment, is coupled to the linear portion 641 of thelinkage 64 and positioned above the supporting member. Due to the weightof the conditioning roll 21 and the linear portion 641, with otherefforts, the restraining member 643 normally contacts a top portion ofthe supporting member 63. The linear portion 641 is also threaded; therestraining member 643 is therefore movable to adjust the roll gapindependent of the first and second eccentrics 61, 62 via moving thelinear portion 641. The restraining member 643 is used to restrict themovement of the linear portion 641 of the linkage 64 within the aperture631 in a first direction (partially downward) and allows movement of thelinear portion 641 within the aperture 631 in a second direction(partially upward) substantially opposite the first direction. In thisregard, if there is an impact from the conditioning roll 21 movingpartially upward, the linear portion 641 can move partially upwardrelative to the supporting member 63. Therefore, the impact bypasses thefirst and second eccentrics 61, 62, the shaft 4, and the actuator 3.

The resilient unit 7 is used for absorbing the impact mentioned aboveand accelerating the conditioning roll 21 to recover into a normalposition after the impact. Referring to FIGS. 4 and 5, the resilientunit 7 in this embodiment is a spring. The resilient unit 7 comprises acurved portion 71 on one end coupling to the frame 11 and a bolt 72 onthe other end coupling to the second connecting portion 6424 of thelever 642. When the sudden impact leads the lever 642 rotate clockwise,the second connecting portion 6424 of the lever 642 moves partiallyrightward, as depicted in FIG. 4. The resilient unit 7 is extended andtherefore provides a resilient force partially leftward on the secondconnecting portion 6424.

Referring to FIGS. 4-5, the eccentric assembly 6 may further include aplate 65 coupled to the frame 11. The outer edges of the first andsecond eccentrics 61, 62 rotatably contact the top of the plate 65.Alternatively, the plate 65 can be omitted or resting in the space.

FIGS. 7A-7F, 8A-8B provides multiple examples of the configuration ofthe eccentric. It is noted that the third portion a3 and the fourthportion a4 are used to represent different portions of the second slot621; the third portion a3 and the fourth portion a4 can be any portions,included but not limited to the ends of the second slot 621. Any ofthese features can be applied to the first eccentric 61, the secondeccentric 62, or both.

FIG. 7A is side view of an eccentric rotating counter clockwise, withdistance between the eccentric slot and the edge increasing gradually.The second slot 621 is positioned eccentrically on the second eccentric62. The second radial distance (D2) between the fourth portion a4 of thesecond slot 621 and an outer edge of the second eccentric is greaterthan the first radial distance (D1) between the third portion of thesecond slot 621 and the outer edge of the second eccentric. The distanceof the supporting member 63 moving upward when it moves from the thirdportion a3 to the fourth portion a4 is calculated the deference betweenD2 and D1. (D2 minus D1.) The roll gap is therefore increased.

It is noted that even if the shaft 4 rotated in the same direction, whenthe eccentric is structured differently, the supporting member 63 willbe moved differently based upon the eccentric. FIG. 7B is side view ofanother embodiment of eccentric rotating counter clockwise, withdistance between the eccentric slot and the edge decreasing gradually.The second radial distance (D2) between the fourth portion a4 of thesecond slot 621 and an outer edge of the second eccentric is smallerthan the first radial distance (D1) between the third portion of thesecond slot 621 and the outer edge of the second eccentric. The distanceof the supporting member 63 moving downward when it moves from the thirdportion a3 to the fourth portion a4 is calculated the deference betweenD1 and D2. (D1 minus D2.) The roll gap is therefore decreased.

FIG. 7C is side view of another embodiment of eccentric rotating counterclockwise, with a different shape; FIG. 7D is side view of anotherembodiment of eccentric rotating counter clockwise, with a differentshape. It is noted that either the eccentric second slot 621 in FIG. 7Aor 7B can be applied to FIGS. 7C, 7D.

It is noted that the slot is not always required to be an eccentricarcuate slot; it can be structured as linear slot or comprise multiplearcuate segments.

FIG. 7E is side view of another embodiment of eccentric rotating counterclockwise, with a linear slot. The support member 63 will move downwardquickly and so does the roll 21 that is coupled to the linkage 64. Theroll gap is decreased quickly as well.

FIG. 7F is side view of another embodiment of eccentric rotating counterclockwise, with a customized slot. The customized slot includes multiplearcuate segment and therefore have multiple radial distances D1-D4. Theroll gap will increase and decrease during the rotation of the secondeccentric 62 depending on the structure of the second slot 621.

It is feasible that the slot of an eccentric is concentric to theeccentric. FIG. 8A is side view of another embodiment of eccentric, therotating axis is off center, the supporting member is positioned in oneend of an arcuate slot. FIG. 8B demonstrates the embodiment of eccentricin FIG. 8A when the supporting member slides to another portion of thearcuate slot. In FIG. 8A, the support member 63 is located in the thirdportion a3 of the second eccentric 62. The distance between the supportmember 63 and the axis of the second eccentric 62 is denoted by H1. InFIG. 8B, the support member 63 is located in the fourth portion a4 ofthe second eccentric 62. The distance between the support member 63 andthe axis of the second eccentric 62 is denoted by H2. The distance ofthe supporting member 63 moving upward when it moves from the thirdportion a3 to the fourth portion a4 is calculated the deference betweenH1 and H2. (H1 minus H2.) The roll gap is therefore increased.

The above describes example embodiment of the present disclosure. Othertypes of eccentrics, such as eccentric slot with the rotation axis isoff center is not depart from the scope of the present disclosure.

The present disclosure further includes a method of adjust a roll gapbetween two conditioning rolls in a mower-conditioner.

Step 1: Change an amount of linear extension of an actuator. Theactuator is coupled to a shaft.

Step 2: Rotate the shaft and a first eccentric of at least one eccentricassembly coupled to the shaft by changing the amount of the linearextension of the actuator into a degree of a rotation of the firsteccentric. Optionally, Step 2 also includes rotating a second eccentricof the at least one eccentric assembly coupled to the shaft.

Step 3: Moves a supporting member within a first slot of the firsteccentric during the rotation of the first eccentric.

Step 4: Moves one of the two rolls coupled to a linkage to adjust theroll gap between the two rolls based upon the movement of the supportingmember within the first slot of the first eccentric.

Step 5: Moves a restraining member to adjust the roll gap between therolls independent of the eccentric.

Referring to FIGS. 9A-9F, another embodiment of an eccentric assembly isdepicted. FIG. 9A illustrates a perspective exploded view of anadjustment assembly 6, which includes three members, or eccentrics: afirst member 65, a second member 66, and a third member 67. In otherembodiments, as shown in FIGS. 11A-B and 12A-B, the adjustment assembly6 may include two members: a first member 68 and a second member 69. Alinkage 64 may include one element (linear portion 641) directly coupledto the adjustment assembly 6 and the roll or multiple elements linkingthe adjustment assembly 6 and roll. The first, second, and third members65, 66, 67 have apertures 651, 661, 671 in the center such that thelinear portion 641 is configured to move within the aperture 651, 661,671 in a first direction (partially downward) and in a second directionsubstantially opposite the first direction. The bottom of the firstmember 65 includes three helical surfaces 653 facing toward threehelical surfaces 662 of the second member 66; the top of the thirdmember 67 includes three helical surfaces 673 facing toward threehelical surfaces 663 of the second member 66. Referring to FIG. 9B, thehelical surfaces 653 are corresponding to helical surface 662; and thehelical surfaces 663 are corresponding to the helical surface 673. Inthis embodiment, the third member 67 is fixed to the frame 11 (notshown) and therefore there is no substantial rotation and verticalmovement relative to the frame. The second member 66 has a connectingarm 664 coupled to an actuator (not shown). The actuator is configuredto extend and contract to rotate the second member 66. In otherembodiments, the members may include a single helical surface or two ormore helical surfaces.

Referring to FIG. 9A, 9D-9F, the aperture 661 of the second member 66has a wider diameter than that of the linear portion 641, such that therotation of the second member 66 is not influenced by the linear portion641. On the contrary, both the first and third members 65, 67 havelocking mechanisms interacting with the linear portion 641. The linearportion 641 includes a pair of locking channels 6411 positioned oppositeto each other as shown in FIG. 9A. The first member 65 includes a pairof locking edges 652 protruding from the edge of the aperture 651 andpositioned opposite to each other. The third member 67 includes a pairof locking edges 672 protruding from the edge of the aperture 671.Because the third member 67 is fixed on the frame 11 and the lockingedges 672 are engaged with the locking channels 6411 of the linearportion 641, the locking edges 672 restrain the linear portion 641 fromrotating about a vertical axis. Because the rotation of the linearportion 641 is restrained and the locking edges 652 of the first member65 are engaged with the locking channels 6411 of the linear portion 641,the rotation about the vertical axis of the first member 65 is furtherrestrained. Also, because the connecting portion (not shown but similarto the first connecting portion 6421 shown in FIGS. 4 and 5) is coupledto the bottom of the linear portion 641, the rotation about the verticalaxis of the linear portion 641 is further restrained. Alternatively, thelinear portion 641 can directly be coupled to one of the conditioningrolls to lift it without the connecting portion of the lever.

In the initial status of the first, second, and third members 65, 66,67, the entire helical surfaces 653 substantially contact the entirehelical surfaces 662; the entire helical surfaces 663 substantiallycontact the entire helical surfaces 673. In this regard, a heightbetween the top of the first member 65 and bottom of the third member 67maintain its minimum and the roll gap is not changed.

Referring to FIG. 9C, when the second member 66 is moved by theactuator, directly or indirectly, to rotate clockwise, the helicalsurfaces 663 slide partially left from the helical surface 673 of thethird member 67. Due to the reaction from the third member 67 which isfixed on the frame 11, the second member 66 is moved upward in adistance denoted by L1. At the same time, since the first member 65 doesnot substantially rotate, the helical surfaces 662 slide partially leftfrom the helical surface 653 of the first member 65. Due to the reactionfrom the second member 66, the first member 65 is moved upward in adistance denoted by L2. In this regard, the change in height between thetop of the first member 65 and bottom of the third member 67 is L1 plusL2. With the restraining member(s) 643 coupled on the threaded linearportion 641 and positioned on the top of the first member 65, thevertical movement of the linear portion 641 caused by the actuator isalso L1 plus L2. Accordingly, the conditioning roll 21 or 22, at leastone side, is moved upward in a distance equal to L1 plus L2.

The restraining member 643 restricts movement of the linear portion 641in a first direction (e.g., downward), setting a minimum distancebetween the first and second conditioning rolls 21, 22, and allowsmovement of the linear portion 641 in a second direction (e.g., upward),allowing the distance between the first and second conditioning rolls21, 22 to increase based upon material passing between the conditioningrolls 21, 22.

Referring to FIGS. 10A-10D, another embodiment of an eccentric assemblyis depicted. One of the differences between this embodiment and that ofFIGS. 9A-9F is the configurations of the linear portion 641 and theapertures 651, 671. In this embodiment, the body of the linear portion641 is polygonal (e.g., hexagonal) with multiple (e.g., six) lockingedges 6412. The apertures 651, 671 are also polygonal, with the samenumber of locking edges 652, 672 in order to engage with the linearportion 641. Because the third member 67 is fixed on the frame 11 andthe locking edges 672 are engaged with the locking edges 6412 of thelinear portion 641, the locking edges 672 restrain the linear portion641 from rotating about a vertical axis. Because the rotation of thelinear portion 641 is restrained and the locking edges 652 of the firstmember 65 are engaged with the locking edges 6412 of the linear portion641, the rotation about the vertical axis of the first member 65 isfurther restrained. Other features are similar to the embodimentspresented in FIGS. 9A-9F.

Referring to FIGS. 11A-11D, another embodiment of an eccentric assemblyis depicted. The adjustment assembly 6 (eccentric assembly 6) in thisembodiment includes two members-a first member 68 and a second member69. The second member 69, similar to the third member 67 in the previousembodiment, is fixed on the frame 11. The first member 68 has a helicalsurface corresponding to that of the second member 69. In addition, thefirst member 68 has a first connecting arm 681 coupled to the actuator3. The actuator 3 is configured to extend and contract to rotate thefirst member 68. The first member 68 includes an aperture (not shown)having a wider diameter than that of the linear portion 641 such thatthe rotation of the first member 68 is not influenced by the linearportion 641. FIG. 11A illustrates the initial status that the entirehelical surface of the first member 68 substantially contacts the entirehelical surface of the second member 69. After the actuator 3 moves thefirst member 68 via the first connecting arm 681 to rotate, as shown inFIG. 11B, the helical surface of the first member 68 and the helicalsurface of the second member 69 merely partially contact each other. Dueto the reaction from the second member 69, the first member 68 is movedupward. With the restraining member 643 coupled on the threaded linearportion 641 and positioned on the top of the first member 68, the linearportion 641 is moved upward.

FIG. 11C illustrates two adjustment assemblies 6 in the initial statusas shown in FIG. 11A. Each of the adjustment assemblies 6 can operateindependently from one another by coupling to an actuator 3. Theadjustment assemblies 6 are coupled to two ends of rolls (such asconditioning roll 21 or 22 in FIG. 1). After the two actuators 3 extendto move the first members 68 of the two adjustment assemblies 6 torotate clockwise, as shown in FIG. 11D, the first members 68 of the twoadjustment assemblies 6 are moved upward and therefore the roll gapbetween the conditioning rolls 21, 22 is changed.

Referring to FIG. 12A-12D, another embodiment of an eccentric assemblyis depicted. In this embodiment, one actuator 3 can simultaneouslyoperate both adjustment assemblies 6. One of the first member 68 of theadjustment assemblies 6 has a first connecting arm 681 coupled to theactuator 3 and a second connecting arm 682 coupled to one end of alinkage 683. The other first member 68 of the adjustment assemblies 6has a third connecting arm 684 coupled to the other end of the linkage683. In this regard, when the actuator 3 extends or contracts, both ofthe first member 68 rotate to lift or drop the ends of a roll to adjustthe roll gap (the distance between the conditioning rolls).

In the embodiments of FIGS. 11A-11D, 12A-12D, the second (lower helical)member is fixed on the frame and the first (upper helical) member ismoved without a locking edge engaging with the linear portion 641.Alternative the second (lower helical) member has locking mechanism suchas locking edges engaging with the linear portion without being fixed onthe frame to retain its position.

Alternatively, the lower helical member is not required to be fixed onthe frame and can also be moved. If the upper helical member positionedabove the lower helical member has locking mechanism such as lockingedges engaging with the linear portion to restrain the rotation of theupper helical member, the lower helical member can rotate and the upperhelical member is moved upward by the rotation of the lower helicalmember.

FIGS. 13-15 illustrate another embodiment of an eccentric assembly for amower-conditioner. The shaft 4 is rotatable underneath the top sheet ofthe mower-conditioner. In this embodiment, an eccentric assembly oreccentric 6 a is affixed on and rotated with the right end of the shaft4. It is feasible that there is an eccentric affixed on and rotated withthe left end of the shaft 4 but not shown in FIGS. 13-15. In thisembodiment, the contour of the eccentric 6 a is similar to a half-moonshape but it could be formed in a variety of other shapes. In someembodiment, the eccentric 6 a is a cam.

FIG. 14 omits a portion of the resilient unit 7 for the clarity of theeccentric 6 a. As seen in FIGS. 14-15, the eccentric 6 a includes atleast a first contact portion 6 a 1 and a second contact portion 6 a 2.A first radial distance S1 is between the first contact portion 6 a 1and the axis of the shaft 4; a second radial distance S2 is between thesecond contact portion 6 a 2 and the axis of the shaft 4. In thisembodiment, the first radial distance S1 is smaller than the secondradial distance S2.

The linkage 64 in this embodiment comprises a linear portion 641, alever 642, a restraining member 643, one or more spacers or washers 644,and a spacer or washer 645. The linear portion 641 is a rod configuredto move within the aperture of the frame in a first direction (partiallydownward) and in a second direction substantially opposite the firstdirection. The restraining member 643 is used to restrict the movementof the linear portion 641 in a first direction (partially downward) andallows movement of the linear portion 641 in a second direction(partially upward) substantially opposite the first direction.

The lever 642 includes a first connecting portion 6421, a roll carryportion 6422, a pivot portion 6423, and a second connecting portion6424. The first connecting portion 6421 provides pivotal connection forthe bottom of the linear portion 641. The roll carry portion 6422 iscoupled to one end of the conditioning roll 21. The pivot portion 6423is directly coupled to the frame 11 and the lever 642 is configured torotate about the axis of the pivot portion 6423. The second connectingportion 6424 is coupled to the resilient unit 7. The resilient unit 7 inthis embodiment provides a force to minimize the distance between thetwo conditioning rolls 21 and 22. The resilient unit 7 provides a forcebiasing the top conditioning roll 21 towards the bottom conditioningroll 22. The spacer 645 is positioned through the left end of theresilient unit 7 and near the second connecting portion 6424. The spacer645 is positioned between two fasteners in this embodiment and istherefore fixed on part of the resilient unit 7. The embodiment merelyshows the spacer 645 located in front of (right at FIGS. 13-15) theconnecting portion 6424 but the spacer 645 can be located behind (leftat FIGS. 13-15) the connecting portion 6424. Optionally, the spacer 645is a heavy flat washer.

Referring to FIGS. 13-15, when the shaft 4 rotates clockwise, theeccentric 6 a rotates together and contacts/engages the spacer 645 ofthe linkage 64 from the first contact portion 6 a 1 to the secondcontact portion 6 a 2. Because the first radial distance S1 is smallerthan the second radial distance S2, the eccentric 6 a pushes against thespacer 645 to move left in a distance equal to the second radialdistance S2 minus the first radial distance S1 (S2−S1). Therefore, thelever 642 shown in FIGS. 13-15 rotates counterclockwise and the rollcarry portion 6422 moves the conditioning roll 21 partially upward. Thelinear portion 641 moves partially upward at the same time. On the otherhand, if the eccentric 6 a contacts/engages the spacer 645 from thesecond contact portion 6 a 2 to the first contact portion 6 a 1, thelinear portion 641 moves partially downward. Alternatively, theeccentric 6 a can directly contact/engage the second connecting portion6424 without the spacer 645.

The one or more spacers 644 between the restraining member 643 and theframe may independently adjust the roll gap. The more spacers used, orthe thicker the spacers, the more the linear portion 641 moves upward.However, the linear portion 641, restraining member 643, and spacer 644may be optional for this embodiment.

The terminology used herein is for the purpose of describing particularembodiments or implementations and is not intended to be limiting of thedisclosure. As used herein, the singular forms “a”, “an” and “the” areintended to include the plural forms as well, unless the context clearlyindicates otherwise. It will be further understood that the any use ofthe terms “has,” “have,” “having,” “include,” “includes,” “including,”“comprise,” “comprises,” “comprising,” or the like, in thisspecification, identifies the presence of stated features, integers,steps, operations, elements, and/or components, but does not precludethe presence or addition of one or more other features, integers, steps,operations, elements, components, and/or groups thereof.

The references “A” and “B” used with reference numerals herein aremerely for clarification when describing multiple implementations of anapparatus.

One or more of the steps or operations in any of the methods, processes,or systems discussed herein may be omitted, repeated, or re-ordered andare within the scope of the present disclosure.

While the above describes example embodiments of the present disclosure,these descriptions should not be viewed in a restrictive or limitingsense. Rather, there are several variations and modifications which maybe made without departing from the scope of the appended claims.

What is claimed is:
 1. A mower-conditioner comprising: first and secondconditioning rolls spaced apart a distance; at least one eccentriccoupled to the mower-conditioner; and a linkage having a lever coupledbetween the at least one eccentric and the first conditioning roll;wherein a rotation of the at least one eccentric about a pivot axiscauses the first conditioning roll to move via the lever, which adjuststhe distance between the first and second conditioning rolls.
 2. Themower-conditioner of claim 1, wherein the eccentric is a cam orhalf-moon shape.
 3. The mower-conditioner of claim 1, wherein the leverrotates in response to the rotation of the at least one eccentric aroundthe pivot axis, and the lever adjusts the distance between the first andsecond conditioning rolls.
 4. The mower-conditioner of claim 1, whereinthe at least one eccentric comprises a first contact portion and asecond contact portion, a first radial distance between the firstcontact portion and the pivot axis is smaller than a second radialdistance between the second contact portion and the pivot axis, and thelever rotates based upon a difference between the first and secondradial distances when the at least one eccentric rotates about the pivotaxis.
 5. The mower-conditioner of claim 4, wherein the at least oneeccentric operable to move a connecting portion of the lever in ashifting distance equal to the second radial distance minus the firstradial distance.
 6. The mower-conditioner of claim 5, further comprisinga spacer positioned between the at least one eccentric and theconnecting portion, wherein the at least one eccentric is operable topush against the spacer to move the connecting portion.
 7. Themower-conditioner of claim 1, further comprising a restraining memberwhich restricts movement of the first conditioning roll in a firstdirection, setting a minimum distance between the first and secondconditioning rolls, and allows movement of the first conditioning rollin a second direction, allowing the distance between the first andsecond conditioning rolls to increase based upon material passingbetween the conditioning rolls.
 8. The mower-conditioner of claim 7,further comprising a resilient unit coupled to the lever and providing aforce to move the first conditioning roll in the first direction.
 9. Themower-conditioner of claim 1, further comprising an actuator coupled tothe at least one eccentric to cause the rotation of the at least oneeccentric.
 10. The mower-conditioner of claim 1, further comprising ashaft operable to rotate, wherein the at least one eccentric rotateswith the shaft.
 11. The mower-conditioner of claim 10, wherein the atleast one eccentric is coupled to the shaft and is operable to move thefirst conditioning roll in a second direction.
 12. The mower-conditionerof claim 11, further comprising a resilient unit coupled to the leverand providing a force to move the first conditioning roll in a firstdirection opposite the second direction.
 13. The mower-conditioner ofclaim 11, wherein the at least one eccentric is affixed on an end of theshaft.
 14. The mower-conditioner of claim 1, further comprising at leastone spacer positioned between the lever and the at least one eccentricand operable to move the lever with the rotation of the at least oneeccentric about the pivot axis.
 15. The mower-conditioner of claim 14,wherein a number of the at least one spacer or a thickness of the atleast one spacer partially determines the distance between the first andsecond conditioning rolls.